Portugues
Reversiology
Saved games stay in this browser only.
About the game
Reversiology is Reversi built to teach. You play against an AI on the classic 8x8 board, and beside it a coach follows every move: a bar shows who is winning, each play you make gets a grade from best to blunder, and when something goes wrong the coach says why, in plain words. You gave away a corner; you left your opponent too many moves; that disc flipped more than it should have.
The opponent comes in nine levels, from one that barely knows the rules to one that plays like the strongest Reversi programs. Win a game and the next one is a level up; lose and it steps down. You can also take back any move, try another line and watch your mistakes show up on a graph of the game, and after each game Key moments picks the few decisions most worth a second look. There are 156 puzzles taken from real games, each with one clearly best move.
Reversiology was made by Frank Force in 2026 and released as free software. Its evaluation uses the weights of the Edax program, and the opening names come from the Egaroucid list.
Playing it here
This is the game as its author publishes it, with one change to the page header (the links that pointed to the author's own site are gone). Everything runs in your browser, the AI included, and nothing is sent anywhere. Your current game, the score against the AI and your settings are kept in this browser; clearing the site's data erases them. Save game and Load game keep a game as a file. The game is in English.
Controls
| Input | Action |
|---|---|
| Click a square | place a disc |
| U | take back your last move |
| H | hint: the coach's best moves |
| O | their idea: what the opponent would play |
| M | show your legal moves |
| Left / right arrows | step through the game |
| Tab, then the arrows and Enter | play from the keyboard |
The rules in short
Black moves first. On your turn you place one disc on an empty square so that a straight line of the opponent's discs lies between it and another disc of yours; all of them flip to your colour. If you have no such move you pass. When neither side can move, whoever has more discs wins.
Tips
Take the corners. A disc in a corner can never be flipped, and it protects the discs along its edges. Avoid the squares right next to an empty corner; they often hand it to your opponent.
More discs is not better, at first. Flipping a lot early gives your opponent plenty of moves. Aim for mobility: keep many moves for yourself and few for the opponent.
Use the puzzles. They teach the big ideas one position at a time.
FAQ
Is there a way to play two-player? Choose "Both (study)" in the new game window to move for both colours.
Why is the opponent so strong at the top level? Its search and evaluation are those of a strong Reversi program, and the top level uses them in full. Start lower and let the ladder move you up.